Dielectric resonator having adjustment plates movable with respect to resonator disc and each other

A dielectric resonator including a dielectric resonator disc, a frequency controller including an adjustment mechanism and a dielectric adjustment plate, which is substantially parallel with the resonator disc, and movable means of the adjustment mechanism in the perpendicular direction with respect to the resonator disc for adjusting the resonance frequency. The frequency adjuster includes a plurality of dielectric adjustment plates, which are substantially installed concentrically and parallel one after another. The mechanical engagement of the plates with each other and with the adjustment mechanism enabling movement of the adjustment plates both with respect to the resonator disc and to each other, so that the adjustment plates are arranged in layers on top of each other as the adjusting movement is proceeding. This results in improved linearity of frequency control and a longer adjustment distance, which both improve the adjustment accuracy.

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Claims

1. A dielectric resonator, comprising

a dielectric resonator disc,
an electrically conductive casing,
a plurality of dielectric adjustment plates which are installed concentrically and parallel with each other and said dielectric resonator disc, a mechanical engagement between said dielectric adjustment plates enabling movement of said adjustment plates in relation to each other and said dielectric resonator disc,
an adjustment mechanism for moving said dielectric adjustment plates in a direction perpendicular to the dielectric resonator disc, for adjusting the resonance frequency of the dielectric resonator, the adjustment plates being arranged to be gradually stacked on said dielectric resonator disc during an adjusting movement towards said dielectric resonator disc, and said adjustment plates being arranged to be gradually unstacked from said dielectric resonator disc during an adjusting movement away from said dielectric resonator disc.

2. A dielectric resonator, comprising

a dielectric resonator disc,
an electrically conductive casing,
a plurality of dielectric adjustment plates which are installed concentrically and parallel with each other and said resonator disc,
an adjustment mechanism connected to the one of said adjustment plates which is the most remote one above the resonator disc, for moving said dielectric adjustment plates in a direction perpendicular to the resonator, for adjusting the resonance frequency of the dielectric resonator,
a spring mechanism for suspending each of the following ones of said dielectric adjustment plates from the respective previous one of said dielectric adjustment plates, said spring mechanism being arranged to keep said dielectric adjustment plates apart from each other in a free suspension, and the adjustment mechanism being arranged to act against the spring mechanism for gradually stacking the dielectric adjustment plates on said resonator disc during an adjusting movement towards said resonator disc.

3. A dielectric resonator comprising

a dielectric resonator disc,
an electrically conductive casing,
a plurality of dielectric adjustment plates, which are installed substantially concentrically and parallel one after another and substantially parallel with the resonator disc,
an adjustment mechanism for moving said dielectric adjustment plates in a direction perpendicular to the resonator disc, for adjusting the resonance frequency, the mechanical engagement of said plates with each other and with the adjustment mechanism enabling movement of the adjustment plates both with respect to the resonator disc and with respect to each other, so that the adjustment plates are arranged in layers on top of each other as the adjusting movement is proceeding,
spring means,
said mechanical engagement comprising that the adjustment mechanism is connected to the adjustment plate most remote above the resonator disc, and that each following one of the adjustment plates being suspended from the bottom surface of the respective previous one of said adjustment plates by said spring means, which in free suspension keeps the adjustment plates apart from each other.

4. A resonator as claimed in claim 3, wherein the adjustment mechanism is arranged to move the adjustment plates in the direction perpendicular to the top surface of the resonator disc, so that in an adjusting movement which is directed downwards, upon a lowest one of said adjustment plates contacting the top surface of the resonator disc, the adjustment plates start to move with respect to each other against the force of said spring means, as the adjusting movement is proceeding, said adjustment plates forming layers on top of each other on the resonator disc, starting from the lowest one of said adjustment plates, and wherein

in an adjusting movement which is directed upwards, the adjustment plates layered on top of each other start to become detached from each other actuated by said spring means starting from said most remote adjustment plate.
Referenced Cited
U.S. Patent Documents
4477788 October 16, 1984 Collinet et al.
4565979 January 21, 1986 Fiedziuszko
4849722 July 18, 1989 Cruchon et al.
5315274 May 24, 1994 Sarkka
Foreign Patent Documents
0294301 December 1987 JPX
Patent History
Patent number: 5703548
Type: Grant
Filed: Jun 4, 1996
Date of Patent: Dec 30, 1997
Assignee: Nokia Telecommunications Oy (Espoo)
Inventor: Veli-Matti Sarkka (Oulunsalo)
Primary Examiner: Robert Pascal
Assistant Examiner: Barbara Summons
Law Firm: Cushman Darby & Cushman Intellectual Property Group of Pillsbury Madison & Sutro LLP
Application Number: 8/640,794
Classifications
Current U.S. Class: With Tuning (333/235); 333/2191
International Classification: H01P 710;